byNitecki, Matthew H; Richardson, Eugene Stanley, 1916- joint author
Drevotella proteana, a new genus and species of colonial hydrozoan, is described from the Middle Pennsylvanian Francis Creek Shale of the Mazon Creek area of northeastern Illinois. It is represented by numerous specimens preserved in iron-stone concretions in which the large, irregularly branched colonies appear as flattened impressions visible by virtue of color contrast Topics: Drevotella proteana, Paleontology -- Pennsylvanian, Paleontology -- Illinois
bySohn, I. G. (Israel Gregory), 1911-; Field Museum of Natural History
A new ostracode species, Paraparchites mazonensis, is described from Mazon Creek concretions in the Middle Pennsylvanian Francis Creek Shale of Savage, 1927 (Desmoinesian = Westphalian C) in northeastern Illinois. The occurrence of this genus suggests a brackish water environment in the areas of formation of the ostracode-bearing ironstone concretions Topics: Ostracoda, Fossil, Paleontology -- Pennsylvanian, Paleontology -- Illinois
Megapleuron rochei Gaudry 1881 from the lower Permian of France is redescribed. Small juvenile specimens from the Middle Pennsylvanian of Illinois are placed in the same genus as the new species M. zangerli. The genus differs from all other contemporaneous dipnoans in the arrangement of the bones in the skull roof Topics: Megapleuron zangerli, Megapleuron rochei, Paleontology -- Pennsylvanian, Paleontology -- Illinois
byMyint Lwin Thein; Nitecki, Matthew H., joint author
Chester gastropods from southern Illinois, eastern Missouri, and north-western Kentucky are described. The method used in discriminating the immature from adult individuals is explained. Fifty-three named species, 20 indetermined species and four variants are described. Four new genera are as follows: Yochelsonospira, Wellergyi, Kinkaidia, Globozyga. -- Thirty-eight new species are as follows: Bellerophon (Bellerophon) claxtonensis -- B. (B.) menardensis -- Knightites (Cymatospira) welleri --... Topics: Gastropoda, Fossil -- Illinois, Gastropoda, Fossil -- Kentucky, Paleontology -- Mississippian,...